Roof-ventilator.



W. W. BIRNSTOCK.

ROOF VENTILATOR.

' APPLIOATION FILED FEB. 6, 1909.

P atenfed 1160.7, 1909.

v I me n For UNITED STATES PATENT OFFICE. WILLIAM w. Bmns'roox, or Yonx,PENNSYLVANIA, AssIeNoa TQ PULLMAN AUTO- MA'IIC VENTILATOR MFG. COMPANY,or YORK, PENNSYLVANIA, A conronarron.

or PENNSYLVANIA.

BOOF-VENTILATQR.

Patented Dec. 7, 1909.

Application filed February 6, 1909 Serial No. 473,478.

To all whom it may concern; i

Be it known that 1, WILLIAM W. BIRN- STOCK, a citizen of the UnitedStates, residing at York, in the county of York, State of Pennsylvania,have invented certain new and useful Improvements in Roof-Ventilators,of which the following'is a description, reference being, had to theaccompanying drawings and to the letters and figures of reference markedthereon.

-Myinvention .relates to new and useful improvements in roof ventilatorsand has for its object'to provide a Ventilator whichshall be simple inoperation and durable in construction.

A further object of the invention is to.

i provide a roof ventilator with a closing damper which may be operatedto control illustration, one embodiment of my invention: Figure 1 is aperspective view of my improved ventilator. Fig. 2.'is.,a longitudinalsectional view through the same.

The body portion 1 of my ventilator is as herein shown cylindrical inshape, and is adapted to be attached in any suitable way i to the roofofthe building which it is desired to ventilate. At the top "of the cylin:drical portion 1, is an upwardl extending conical shaped flange 2, whichis riveted to the upper end of the body portion 1 of the ventilator.Said flange extends downwardly and outwardly away from the body portionof the ventilator. 'I have provided the flange 2, with a plurality ofradial and vertical plates, 3, 3, which are riveted to the flange orsecured thereto in any suitable way. Said plates 3, 3, are spaced aboutthe flange preferably an equal distance. A conical shaped plate 4, restsupon the upper edges of the plates 3 and is-riveted thereto. The conicalplate 4 is arranged substantially parallel with the plate 3 and has acentral opening slightly less in diameter than the'diameter of thecylindrical body portion 1. It is obvious however, that the exactproportions of the opening in the plate 4 are immaterial. The inneredges of the plates 3 are curved "preferably as shqym in the drawings. I

have also provided'a plurality of radial and vertical plates 6, whichare preferably disposed dlrectly over the plates 3 and are riveted tothe conical plate t, although said plates 6 may be staggered relative tothe plates 3. j

Mounted on the plate 6 is a cap 7 which as shown in the drawings, isflat at the cen-. tral portion and is then bent downward to form aconical shaped plate similar. to the shape of the plate t. Said cap 7may however, be pointed at the top.

It will thus be seen that I have provided a ventilator which has acentral cylindrical o enin leadin into the to ortion and the P e g P Ptop portion is constructed so as to provide radial passages .extendingoutwardly and downwardly. These passages allow a free circulation of theair into the ventilator, across the top of the cylindrical body portionand out of the ventilator at the opposite side as shown for example, bythe arrows on in Fig. 2. This movement of'the air through the top of theventilator causes a very strong upward draft through the cylindricalbody portion of the ventilator in the direction of. the arrows indicatedat b. 'Itwill readily be seen therefore, that the suction r 4 caused bythe passage of the air through the top of the ventilator will aidgreatly. in ventilating a room with which my ventilator communicates.

As a means for controlling the opening in the cylindrical body portion,I have provided two semi-cylindrical dampers 8 and 9. These dampers arecarried by pivoted rods 10 and 11' at their lower ends as shown in Fig.2. At the upper ends each of the dampers carries an ear 12, which ispivoted to an arm 13 which in turn is pivoted to a c0llar 14 rigidlysecured to a tube 15. The tube 15 extends through. the tube guide plates16 and 17 which operate to guide the rod ortube in."a verticaldirection. It will readily'be seenthat when the tube is raised thecollar 14 is raised and through the arms 13, the dampers are lifted tothe position shown in Fig. 2. If the tube 15 should be lowered, thecollar 14 will move downward allowin' these dampers to move down intothe positlon shown in dotted lines in Fig.2. In this position, the lowerends of the arms 13 rest against the guide rod 17 mediately andquicklyclose. vided the chain 19 with a fusible link 20.

and holds the dampers in a horizontal position thus closing theopeni'ng-throughthe body portion of the ventilator.

As a means for operating the tube 15, I have provided the upper endthereof with an car 18 to which is connected a chain 19. The ('ihain 19extends over a pulley 20 secured to'the cap 7, and thence downwardthrough the tube 15. The chain extends down to a convenient placewherethe same may be op-' erated so as to lift the tube 15 or lower the same,said chain being secured to any suitable stationary object to hold thedampers open. If the chain should be released the weight-of the tube 15,the arms 13, and the dampers 12, will cause the dampers to im- In caseof a fire, when the dampers are open, the forced draft through theventilator would quickly carry the flames .up around the fusible link 20which would fuse and release the upper portion of the chain so that.

the dampers would immediately close and thus close all draft through theventilator. Having thus particularly described my invention, what Iclaimas new and desire to secure by Letters Patent, is:

1. .A roof ventilator including incombination a. body portion forming acentral.

cap and said body portion for forming ra- I- have pro l 1 dial passagesfor the movement of the air above said-body portion, pivoted damperslocated in said body portion for-closing the passage therethrough,achain for raising and lowering said dampers, said chain having afusible link therein.

3. A roof ventilator including in combination, a body portion includinga central passage therethrough, dam ers for closing the passage throughsaid bo y portion, arms secured to said dampers, a tube extending aboveand' below said dampers centrally thereof to which said arms arepivoted, and a chain for raising and lowering said tube extendingthrough said tube.

4. A roofventilator lncluding in combi nation a body portion, dampersfor closing the opening n said body portion, a pivotal support locatedat the inner sides of said dampers, ears carried 'by the outer ends ofsaid dampers, arms pivoted to saidears, a

tube, a collar carried by said tube to which ,said arms are pivoted, achain secured to said tube, a-pulley over which said chain passes, and afusible link formed in said' chain.

'5. A roof ventilator including in combination .a cylindrical bodyportion, spaced,

guide rods carried by said body portion, a central tube guided by saidguide rods, dampers located between said guide rods, arms pivoted tosaid dampers, a'collar carried by said tube to-which said arms arepivoted, and means for raising and lowering said tube.

In-testimony whereof I aflix my signature,

in presence of two witnesses.

WILLIAM w. BIRNSTOGKJ Witnesses: O. A. LAU,

-.THOS. B. LOUCKS.

